/Engine/Source/Runtime/CoreUObject/Public/UObject/GarbageCollectionSchema.h
Describes member variable types, AddReferencedObject calls and stop/jump instructions used by VisitMembers
namespace UE { namespace GC { enum EMemberType { Stop, Jump, Reference, ReferenceArray, StructArray, StridedArray, SparseStructArray, FieldPath, FieldPathArray, FreezableReferenceArray, FreezableStructArray, Optional, DynamicallyTypedValue, ARO, SlowARO, MemberARO, Count, } } }